android Bitmap 读取缩放图片

  Bitmap rawbitMap= BitmapFactory.decodeStream(mContext.getAssets().open("weibopic.jpg"));     //TODO:     // 得到图片原始的高宽     int rawHeight = rawbitMap.getHeight();     int rawWidth = rawbitMap.getWidth();     // 设定图片新的高宽     int newHeight = 200;     int newWidth = 100;     // 计算缩放因子     float heightScale = ((float) newHeight) / rawHeight;     float widthScale = ((float) newWidth) / rawWidth;     // 新建立矩阵     Matrix matrix = new Matrix();     matrix.postScale(heightScale, widthScale);      Bitmap resizeBmp =Bitmap.createBitmap(rawbitMap,0,0,rawWidth,rawHeight,matrix,true);